To solve the equation \( 7(x - 9) = -21 + 21 \), we first simplify the right side:
\[ -21 + 21 = 0 \]
Now, the equation is:
\[ 7(x - 9) = 0 \]
Next, we divide both sides by 7:
\[ x - 9 = 0 \]
Now, we add 9 to both sides:
\[ x = 9 \]
Thus, the solution is:
\[ x = 9 \]